** Description changed:

+ [Impact]
+ When entering the lock-screen mode, gnome-shell disables all the extensions. 
It can happen that under certain conditions ubuntu-dock re-enables itself, 
causing the ubuntu-dock to appear in the lock-screen, exposing sensitive 
information. One possible way to reproduce this is to enable dash-to-dock and 
ubuntu-dock at the same time.
+ 
+ [Test Case]
+ 1. Make sure ubuntu-dock is enabled
+ 2. Enable dash-to-dock too
+ 3. Lock the screen
+ 4. Make sure the dock does not appear on the lock screen
+ 5. Make sure there is no warning is the journal
+ 
+ [Possible Regressions]
+ Even if it's something we don't really support please make sure that you can 
use dash-to-dock without uninstalling ubuntu-dock.
+ 
+ [Original Bug]
+ 
  After an update from ubuntu 16.04 to 18.04 the dock is aviable on the 
lockscreen after user login.
  I did not configure this knowingly. Also i can start every application which 
is available on the dock.
  Settings, virtual box, visualstudio code and so on.
  
  After the update to 18.04 i just configure the screen frequency to 144Hz
  and the night mode on. And attach the dock on bottom.
  
  I later undid these customizations back to configuration before, but the
  dock is stil aviable on lockscreen.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gnome-settings-daemon 3.28.1-0ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sat May  5 18:30:16 2018
  InstallationDate: Installed on 2018-04-08 (27 days ago)
  InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 
(20180228)
  ProcEnviron:
-  TERM=xterm-256color
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=de_DE.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm-256color
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=de_DE.UTF-8
+  SHELL=/bin/bash
  SourcePackage: gnome-settings-daemon
  UpgradeStatus: Upgraded to bionic on 2018-05-01 (3 days ago)
- --- 
+ ---
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2018-04-08 (27 days ago)
  InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 
(20180228)
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: gnome-shell-extension-ubuntu-dock 0.9.1
  PackageArchitecture: all
  ProcEnviron:
-  TERM=xterm-256color
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=de_DE.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm-256color
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=de_DE.UTF-8
+  SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Tags:  bionic
  Uname: Linux 4.15.0-20-generic x86_64
  UpgradeStatus: Upgraded to bionic on 2018-05-01 (4 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True

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https://bugs.launchpad.net/bugs/1769383

Title:
  Ubuntu dock/launcher is shown on the lock screen

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